I used a child figure (can't remember the percentage) + male, some pot belly, then some of my face morphs.

Sent the figure to Hexagon. Tweaked it. Zeroed the figure in Daz and sent the morph back to the zero figure. It morphs fine except I notice when I go into joint editor the figures skeleton doesn't seem to scale down with the morph.

If you'd not zeroed the figure, but loaded your changes as a morph on top of the child morph etc. then the child morph would have dealt with (most of) the rig altering for you - and you'd also have been able to share the results with others, should you wish.